[Rockhounds] petrified wood from Glass Buttes, OR?

[DonH]

Howdy,

One of my neighbors, in return for giving him some knappable obsidian I 
bought at the Barter Faire, gave me a large piece of material from Glass 
Buttes.  I said, "oh wow, petrified wood!"  He said no, it's obsidian. 
Now, it is about 2 ft. long and shaped like a tree section, dull brick 
red, with ring structure and little openings or channels (xylem? phloem? 
  I can't remember my biology!) arranged in regular patterns.  The rings 
are eccentrically shaped, not really rings at all, but they are layered 
distinctly from inward out.  On the outer surface, the breakage pattern 
reveals thin layers.  Everything about this says wood to me.  But he 
says there are huge formations of it near Glass Buttes.  I didn't want 
to argue.  Perhaps he is confusing this with mahogany obisidian (which 
has a more orange hue and is glassy, not dull?)  Does this sound like 
something anyone has seen at Glass Buttes?

I can provide a photo later.

best,
Don